8 Jun
2007
8 Jun
'07
5:50 p.m.
Regarding RTP relay (e.g. media proxy), and transcoding --
This topic has come up many times before in various forms, but I still have
not found any obvious solution that's highly scalable and cheap (well sure,
I can dream). We have lots of customers behind various firewalls using
various codecs. Customers call each other (both parties behind firewall)
and to/from carriers.
Certainly this is a common use-case. What do you do? What are best known
practices? Commercial media gateway, or open-source solutions?
We use both OpenSER and a custom B2BUA written against the NIST Java stack.
We need a way to transcode when needed. Obviosly mediaproxy module is
great, but doesn't transcode.
Ideally, what I'm looking for:
* at the point where our system determines that transcoding or rtp relay is
needed, a media gateway is chosen based on network proximity (e.g.: 1/2 our
customers are in the U.S., 1/2 in Brazil; should pick a media gateway
accordingly to minimize network path).
* our system then signals the media gateway (mgcp?) to setup the channels,
and modifies the SDPs in the SIP path accordingly.
* even more ideally: the media gateway signals our system with inband or
rfc2833 dtmf events, plus rtcp reports when available.
I think Asterisk could be hacked to do this.
Does anyone know of a commercial product that's not too expensive?
Thoughts? Advice?
thanks,
--
Ryan Mitchell <rjm(a)tcl.net>
Telecom Logic, LLC
http://www.tcl.net
9 Jun
9 Jun
11:02 a.m.
Dear Sir,
Why you need transcoding? It is heavy job for pc server.and you need pay for G.729
license.
We use RTP relay too. But we write our own RTP relay server. It could handle more than
300 G.729 calls at once with a USD 800 linux pc.
Best regards,
Gang Liu
----- Original Message -----
From: Ryan Mitchell
To: Users(a)openser.org
Sent: Friday, June 08, 2007 10:50 PM
Subject: [Users] rtp relay & transcoding
Regarding RTP relay (e.g. media proxy), and transcoding --
This topic has come up many times before in various forms, but I still have not found
any obvious solution that's highly scalable and cheap (well sure, I can dream). We
have lots of customers behind various firewalls using various codecs. Customers call each
other (both parties behind firewall) and to/from carriers.
Certainly this is a common use-case. What do you do? What are best known practices?
Commercial media gateway, or open-source solutions?
We use both OpenSER and a custom B2BUA written against the NIST Java stack. We need a
way to transcode when needed. Obviosly mediaproxy module is great, but doesn't
transcode.
Ideally, what I'm looking for:
* at the point where our system determines that transcoding or rtp relay is needed, a
media gateway is chosen based on network proximity (e.g.: 1/2 our customers are in the
U.S., 1/2 in Brazil; should pick a media gateway accordingly to minimize network path).
* our system then signals the media gateway (mgcp?) to setup the channels, and modifies
the SDPs in the SIP path accordingly.
* even more ideally: the media gateway signals our system with inband or rfc2833 dtmf
events, plus rtcp reports when available.
I think Asterisk could be hacked to do this.
Does anyone know of a commercial product that's not too expensive? Thoughts?
Advice?
thanks,
--
Ryan Mitchell <rjm(a)tcl.net>
Telecom Logic, LLC
http://www.tcl.net
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12 Jun
12 Jun
11:16 p.m.
You are using media proxy w/SER then? Sometimes depending on the
combination of customer and carrier we are forced to transcode.
Can some people tell me what systems/software they use for transcoding?
On 6/9/07, Gang Liu <gang_l(a)bol2000.com> wrote:
Dear Sir,
Why you need transcoding? It is heavy job for pc server.and you need
pay for G.729 license.
We use RTP relay too. But we write our own RTP relay server. It could
handle more than 300 G.729 calls at once with a USD 800 linux pc.
Best regards,
Gang Liu
--
Ryan Mitchell <rjm(a)tcl.net>
Telecom Logic, LLC
http://www.tcl.net
13 Jun
13 Jun
5:58 a.m.
Our own rtp proxy in C++.
Asterisk could do transcoding, you could have a try.
Best regards,
Gang Liu
----- Original Message -----
From: Ryan Mitchell
To: Users(a)openser.org
Sent: Wednesday, June 13, 2007 4:16 AM
Subject: Re: [Users] rtp relay & transcoding
You are using media proxy w/SER then? Sometimes depending on the combination of
customer and carrier we are forced to transcode.
Can some people tell me what systems/software they use for transcoding?
On 6/9/07, Gang Liu <gang_l(a)bol2000.com> wrote:
Dear Sir,
Why you need transcoding? It is heavy job for pc server.and you need pay for G.729
license.
We use RTP relay too. But we write our own RTP relay server. It could handle more
than 300 G.729 calls at once with a USD 800 linux pc.
Best regards,
Gang Liu
--
Ryan Mitchell <rjm(a)tcl.net>
Telecom Logic, LLC
http://www.tcl.net
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